Detection of trends climate pluviometric precipitation in years anomalous (many) dry for the county of Caicó-RN

• Autor(a) principal: SILVA, Bruno Claytton Oliveira
• Data de Publicação: 2017
• Outros Autores: Nóbrega, Ranyére Silva, Soares, Ana Maria Jerônimo
• Tipo de documento: Artigo
• Idioma: por
• Título da fonte: Revista Cerrados (Montes Claros. Online)
• Texto Completo: https://www.periodicos.unimontes.br/index.php/cerrados/article/view/1311
• topic: Precipitação Pluviométrica; Estiagem Prolongada; Teste de Mann-Kendall.; Pluviometric Precipitation; Dry; Mann-Kendall test.; Precipitación Pluviométrica; Estiramiento Prolongado; Prueba de Mann-Kendall.

The objective of this work was to analyze the trend of annual accumulated Pluviometric Precipitation (PPAA), especially in years classified as anomalous dry or very dry, for the municipality of Caicó-RN. For that, the historical series corresponding to the period of 1911 a 2009, obtained from the Rede Hidroclimatológica do Nordeste, belonging to the Superintendência de Desenvolvimento do Nordeste (SUDENE) was used. In addition, the following methodological and technical resources were used: Frequency Distributions; Measures of Central Tendency and Dispersion; Kolmogorov-Smirnov tests; Dot-plot graphics; T test for single sample (ɑ = 0.05); And finally, the Mann-Kendall test (ɑ = 0.05). The results indicated that 35.4% of the total data series (99 years) were considered below normal, 15.2% of which were identified as very dry and 20.2% as dry. In addition, the variability of precipitated totals by category (very dry and dry) was higher in dry periods (CV = 37.2%) than in dry years (CV = 9.9%). In addition, it was noted that PPAAs, for both categories, did not present significant differences in relation to the mean of the series. Finally, different trends were observed for the two categories in question, being positive for the very dry years and negative for the dry years.